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Flight Reliability

UA 555 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 555 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

70%
Arrive within 15 minutes
22 min
Average arrival delay
3.3%
Cancelled
2 min early
Median arrival delay

Based on 450 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(67 flights)
  • Tue67%(61 flights)
  • Wed76%(63 flights)
  • Thu62%(65 flights)
  • Fri67%(67 flights)
  • Sat80%(44 flights)
  • Sun67%(66 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM71%(289 flights)
  • 6–9 PM72%(83 flights)
  • 9 PM–12 AM62%(55 flights)
On-time trend by month
80%
May

Jun 53% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%34
July 202548%23
August 202561%31
September 202583%29
October 202546%33
November 202562%53
December 202555%29
January 202682%27
February 202692%25
March 202681%32
April 202683%72
May 202680%45
Departures on time
70%
Diverted
0.4%
Flights flown
433
Months covered
12

Keep nerding

Based on 450 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.